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charging system problems 89 tracker

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alt show's 100% output but when i turn light's,radio,heater alt start's squealing and output drop's to 0%. I turn everything off and squealing stop's and output is a 100% again. i assume it is the alt. but guy at schmuck's said it could still be the battery.:banghead: replacing the alt cost's more then the battery but only want to replace what is broken. posted by  dharrington1974

I would have to say alternator. If the belts spinning on the pulley, you'll get the squeaking noise. However a bad alternator may have junked your battery. Happened to me on my old 240sx. Replaced battery twice before I replaced the alternator. Not sure if that fixed it tho, blew the motor about a week later. posted by  DBain

Had the same issue with my eclipse. Its a bad pully/bearing on the alternator. Had to go through 4 remans before i got one that worked. See if you can get a "new" one if its not too expensive. posted by  99_clipped_gsx